山西晋中吕梁地区土壤重金属背景值研究

土壤重金属背景值浓度是土壤环境质量评估的重要标准。通过进行系统、大规模的采样，计算提出了山西中部地区土壤重金属含量背景值。研究结果表明，山西中部地区土壤Cd含量的背景值为0.087 mg/kg、Cr为46.90 mg/kg、Cu为17.62 mg/kg、Ni为26.50 mg/kg、Pb为26.02 mg/kg、Zn为57.95 mg/kg，这六种土壤重金属元素背景值均低于国家土壤环境质量一级标准（GB15618-1995）。与全国土壤背景值比较，山西省中部地区的Cd、Ni、Pb含量与全国水平基本一致，而Cr、Cu、Zn均小于全国对应值。

Background value of soil heavy metal in the region of Jinzhong and Lvliang of Shanxi

Soil background concentrations of heavy metals are important criterion for the assessment of soil environmental quality. The background values of soil heavy metals (Cd ，Cr ，Cu ，Ni ，Pb and Zn) were investigated based on an extensive investigation in the central region of Shanxi. The revised background concentrations of the soils in Shanxi are proposed to be 0.087 mg/kg for Cd，46.90 mg/kg for Cr，17.62 mg/kg for Cu，26.50 mg/kg for Ni，26.02 mg/kg for Pb，57.95 mg/kg for Zn. All the heavy metals in the soils were lower than Grade Ⅰ of environmental quality standard for soils. Compared with the national soil background value, Cd, Ni and Pb content in the central region of Shanxi Province is consistent with the national , but the contents of Cr, Cu, Zn were less than the corresponding values of the national.